Publication detail
Designing, Modelling and Testing of Vibration Energy Harvester with Nonlinear Stiffness
RUBEŠ, O. HADAŠ, Z.
English title
Designing, Modelling and Testing of Vibration Energy Harvester with Nonlinear Stiffness
Type
conference paper
Language
en
Original abstract
This paper is focused on a design of a piezoelectric vibration energy harvester with an additional nonlinear stiffness. Common piezoelectric energy harvesters consist of a cantilever with piezoceramic layers and a tip mass for tuning up the operation frequency. This system is excited by mechanical vibrations and it provides an autonomous source of electrical energy. A linear stiffness of the cantilever has very narrow resonance frequency bandwidth which makes the piezoelectric cantilever sensitive to tuning up of the resonance frequency. It could be tuned only for one narrow vibration frequency bandwidth. The piezoelectric vibration energy harvester with nonlinear stiffness could provide the resonance frequency bandwidth wider and it allows energy harvesting from the wider bandwidth of excitation vibrations. The additional nonlinear stiffness is implemented by using a set of permanent magnets. A simulation and an experiment were performed and the results show a wider resonance bandwidth. However, it depended on direction of vibration frequency sweeping. The frequency bandwidth is more than three times wider but there is only a half resonance amplitude of oscillations. That means that the maximal harvested power is lower but the average harvested power around resonance frequency was higher which was the goal of this research.
English abstract
This paper is focused on a design of a piezoelectric vibration energy harvester with an additional nonlinear stiffness. Common piezoelectric energy harvesters consist of a cantilever with piezoceramic layers and a tip mass for tuning up the operation frequency. This system is excited by mechanical vibrations and it provides an autonomous source of electrical energy. A linear stiffness of the cantilever has very narrow resonance frequency bandwidth which makes the piezoelectric cantilever sensitive to tuning up of the resonance frequency. It could be tuned only for one narrow vibration frequency bandwidth. The piezoelectric vibration energy harvester with nonlinear stiffness could provide the resonance frequency bandwidth wider and it allows energy harvesting from the wider bandwidth of excitation vibrations. The additional nonlinear stiffness is implemented by using a set of permanent magnets. A simulation and an experiment were performed and the results show a wider resonance bandwidth. However, it depended on direction of vibration frequency sweeping. The frequency bandwidth is more than three times wider but there is only a half resonance amplitude of oscillations. That means that the maximal harvested power is lower but the average harvested power around resonance frequency was higher which was the goal of this research.
Keywords in English
Nonlinear Stiffness, Vibrations, Energy Harvesting, Piezoelectricity, Resonance, Bandwidth, Bifurcation
Released
30.05.2017
Publisher
SPIE
Location
Barcelona
ISBN
9781510609938
ISSN
0277-786X
Book
Proceedings of SPIE - The International Society for Optical Engineering
Volume
10246
Edition number
1
Pages from–to
102460W-1–102460W-9
Pages count
9
BIBTEX
@inproceedings{BUT138232,
author="Ondřej {Rubeš} and Zdeněk {Hadaš},
title="Designing, Modelling and Testing of Vibration Energy Harvester with Nonlinear Stiffness",
booktitle="Proceedings of SPIE - The International Society for Optical Engineering",
year="2017",
volume="10246",
month="May",
pages="102460W-1--102460W-9",
publisher="SPIE",
address="Barcelona",
isbn="9781510609938",
issn="0277-786X"
}